Thank you for your interest! You will receive the email with a link to your download shortly. Enter the world of sustainable leather tanning In the meantime… have a look at how Zeology works and discover the science and chemistry of sustainable leather tanning. PUMA develops biodegradable RE:SUEDE sneaker with Zeology PUMA has developed an experimental version of its most iconic sneaker to test for a product to make it biodegradable. The RE:SUEDE is made from Zeology tanned suede. Are Zeology leather products available? The answer is: yes! Zeology leather is commercially available and you can already find it in footwear, car seats, bags and other items.